Apparatus for producing calcium cyanamid.



F. S. WASHBURN.

APPARATUS POB. PBGDUGING CALCIUM GYANAMD.

PATENT OFFICE.

FRANK s. WASHBUEN, oENAsHvrLLE, TENNESSEE, AssrGNon To AMERICAN CYAN- AMID COMPANY, 0F BALTIMORE, MARYLAND. A ("n'QPORATION 0F MAINE.

APPARATUS :ron rEoDUcING CALCIUM GYANAMID.

specication of Letters Patent.

To all 'whom it may concern:

Be it known that I, FRANK S; WASHBURN, a citizen of the United States, residing at Nashville, in the county of Davidson and State of Tennessee, have invented certain new and useful/Improvements in Apparatus for Producing` Calcium-Cyanamid; yand I do hereby declare the following to be a f ull, clear, and exact Ndescription of the invention, such as will enable others skilled in the art to which` it appertains to make and use the same. I

This invention, relates to a process of and an apparatus for producing calcium cyanamid in ovens or retorts and has for its object the improvement of the method. of compel.- ling the react-ion between the nltrogen and carbid, and for holding the same in position during its manufacture; thereby not only improving the uniformity of the product but also producing a greater yield of calcium cyanamid.

In the retorts heretofore employed the central open space through the mass of carbid has not beenas eilicient as has been desired in affording a ready means for the\ni` trogen gas to attack the finely divided carbid, and, therefore, it has been found desirable in practice to improve this means. And, further, in the older methods, after the re- .action is once started any passages which might have existed between the outer walls of the lmass of carbid and the inner walls "of the retort were soon more or less obstructed and, therefore, the free passage of the vnitrogen in a measure cut 0H.

This invention obviates these ob]ections and consists in the novel steps constituting` the process as well asin the details of construction and combinatlons of parts more fully hereinafterl set forth and particularly pointed out in the claims.

' Referring to the accompanying drawings forming a part of this specification, in which illustrating in longitudinal section, an oven .made in accordance with this inventin; Fig. 2, is a transvergegsectional.viewof,- th'eparts shown in Figf; Fig. 3,-1s a view lcustomary to provide centrally the center of the mass.

ike 'parts in all' ther` Asimilar to Fig. 2, but illustrating a slightly modified form of means for holding the carbid.; and, Fig. 4, is a sectional view of a' detail of the invention.

f l illustrates any suitable retort or vessel, 2 any suitable means for'introducing nitrogen gas into the vessel 1, 3 any suitable closure'forsaid Vessel, and 4 any suitable meansfor creating the'desired temperature inside thevessel, in this instance' shown as a resistance heater connected to the lead wires -5 and 6. f l

.As stated above, it has heretofore been through the mass of carbid 7 a space 8 t rough which the nitrogen gas passed andv carbid all around the same. But it has been yfound in practice that the attacked the" assages of the.

Patented July 25,' 1911. A Application led March 4, 1910. Serial No. 547,357.

nitrogen into the interior of) the mass soon become clogged with the result that the reaction was found to have been imperfect in To obvate these objections, I provide a suitable foraminous can or vessel 9 preferably made of Wire cloth and suitably supported as by the brackets or other supports 10 on the lnte'rior of the vessel 1. The bottom of the foraminous vessel 9 maybe of the same/material as the outer wall or of any other suitable foraminous or perforated substance.

center of the vessel 9 I provide hollow tube l1 inclosing the space 8 through which nitrogen may be freely passed, and if a resistance heater such saidheater may also be located in. said tube 11, as illustrated. The vessel 9 is preferably held away'from the inside of the vessel-1 Through the by brackets such as 12 in order to leave aiif annular space 13 in which the nitrogen may freely circulate.

The'calcium carbid is preferably used in a lnely divided condition, and, therefore, ia is liable to'vnd its wal through' the walls.

tulle 11,k In orderft,

of the vesse19 and l prevent this, I dprefer to line the interiori of the vessel 9 an to cover theex'terior of the vtube 11 `with layers of corrugated paper 14;.

as illustrated.

a foraminous l as 4 is employed als ione. i

esami ner Wall of saidputer vessel; means to pren testimony whereof., I afiix my signaw vent finely divided czuffbid-l fijom passing ture, in presence of two Witnesses. through the said tube and sind inner vessel; FRANK Sg WWSHBURN.

andmeans comprising a resister te heat saic carbid to the temperature requisite for the W'itnesses, production of said eyanamid, subseiially STANLEY -ASNA? as described. I WEAVER HARRIS. 

